This from Centers for Disease Control, regarding an outbreak of Rift Valley 
Fever in the Garissa and Wajir districts of Kenya:

(excerpt)   "Two thirds of the 66 patients who provided information on 
potential risk factors reported having an animal that was recently ill. The most 
frequently reported RVF risk factors during the 2 weeks preceding illness onset 
were drinking unboiled (raw) milk (72%); living within 100 meters of a swamp 
(70%); having an ill animal (67%); drinking milk from an ill animal (59%); 
working as a herdsman (50%); having a dead animal (50%); and slaughtering an animal 
(42%)."

Self-Righteously Yours,  Christopher 

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